2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Ray Optics

JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be [KCET 2004]

    A)            0.4 m                                       

    B)            0.2 m

    C)            0.1 m                                       

    D)            0.75 m

    Correct Answer: B

    Solution :

               \[f=\frac{R}{2\,(\mu -1)}\]\[\Rightarrow R=2f(\mu -1)\]\[=2\times 0.2\,(1.5-1)\]=0.2m.


You need to login to perform this action.
You will be redirected in 3 sec spinner